Six in ten Brexiteers are now backing Mr Johnson‘s Party, the highest level since the 2017 election.

Labour in contrast dropped one per cent to 23 per cent, but has picked up Remain votes according to the poll by Opinium for the Observer.

The Lib Dems saw the largest fall, dropping five per cent from 20 per cent to 15 per cent, including losing seven per cent of Remainers.